Other
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5659a&link_type=abstract
Journal of Geophysical Research, vol. 84, Sept. 10, 1979, p. 5659-5668.
Other
103
Ice Reporting, Lunar Composition, Lunar Surface, Polar Regions, Cold Traps, Iron, Latitude, Lunar Atmosphere, Lunar Temperature, Lunar Topography, Meteoritic Composition, Moisture Content, Solar Wind, Surface Temperature, Temperature Distribution, Moon, Polar Regions, Ice, Volatile Elements, Water, Solar Wind, Iron, Reduction, Regolith, Meteoroids, Comets, Outgassing, Interior, Photodissociation, Absorption, Sputtering, Decomposition, Shadows, Surface, Transport, Diffusion, Source Medium, Impacts, Vaporizat
Scientific paper
The idea that ice and other trapped volatiles exist in permanently shadowed regions near the lunar poles was proposed by Watson, Murray, and Brown (1961). It is reexamined in the present paper, in the light of the vast increase of lunar knowledge. The stability of the traps and the trapping mechanism are verified. Four potential sources of lunar H2O, namely (1) solar wind reduction of Fe in the regolith, (2) H2O-containing meteoroids, (3) cometary impact, and (4) (the least certain) degassing of the interior, can supply amounts of trapped H2O estimated in the range of 10 to the 16th to 10 to the 17th g. Two important destructive mechanisms have been identified: photodissociation of H2O molecules adsorbed on the sunlit surface and sputtering or decomposition of trapped H2O by solar wind particles. The effect of impact gardening is mainly protective. The question of the presence of H2O in the traps remains open; it can be settled by experiment.
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